One-part expansion-shield.



H'- B. NEWHALL, h. 6: H. W. PLBISTER. ONE PART EXPANSION SHIELD. nrmcnron FILED MAR. 12, 1912'.

. 1,062,992. Patntea May 27,1913.

' man/Ins UNITED STATES PATENT OFFICE.

HENRY B. NEWHALL, m,- or rmmrrnrn, AND HENRY w. PLEIS'IER, or wns'rrmnn, New JERSEY, assronons TO HENRY LB. NEwnALL, or. PLAINFIELD, NEW JERSEY.

ONE-lE'ART EXPANSION-SHIELD.

, Patented May 27,1913.

Application filed March 12, 1212. Serial No. 688,256.

To all whom, it may concern:

Be it known that we, HENRY B. NEWHALL, J r., and HENRY'W. PLnIs'rER, citizens of the United States, residing, respectively, at Plainfield and WVestfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in One- Part Expansion-Shields, of which, the following is a specification.

Our present invention has to do with expansion shields formed of sheet. metal and generally similar to the shield described and claimed in our copending application, Se-

rial No.. 683,257, filed of even date herewith, and covering a shield formed in two separate parts which are expansible in diametrically opposite directions by the action of a bolt working therebetween.

Our present object consists of forming, from a single piece of sheet metal, a bolt shield comprising two parts which are expansible'in diametrically opposite directions by the action of a bolt working therebetween. Each of these'parts comprises an outer section adapted to grip the wall of an opening, and an inner section which is so formed as to constitute an adflancing screw to cooperate with the threads of a bolt. The sections are also provided with cooperating means which space and support them in proper relation, for ready disposition within an opening in which they are to be expanded.

Our invention further contemplates the provision of an inner section for each shield part which may have a continuous thread from end to end or the thread of which may be interrupted and in spaced series throughout, or even a single thread series at each end, each form having its particular advantages. In the accompanying drawing, Figure 1 is alongitudinal section through both parts of a one-part shield. Fig. 2 is a plan View of the blank before concaving, Fig. '3 is a transverse section taken on line 3-3 of Fig. 1, Fig. dis a similar View taken on line 3 3 of Fig. 1, Fig. 5 1s aview similar to I parts, we desire-to be understood as speaking of the parts irrespective of'the fact that in one form they are independent, while 1n the other form they are connected.

Referring now particularly to the figures .of the drawing, the shield comprises parts- A and B, each of which in turn, consists of an inner section C and an outer section D. The parts A and B are'simul-taneously stamped from sheet metal in the form shown in Fig. 2, the sections C and D being in endt-o-end relation in the same plane, andconnected by webs E of the same material and the sections C being connected at their opposite ends by a web F.

Each section C is widened adjacent one end in order to provide projecting side edges.

C, which need only extend for a port-ionof its length, and is atthe same time formed with a series of transverse corrugationsC, extending throughout its length, the ends of which corrugations terminate short of the side edges C Each section D is of a width substantially'equal to the greatest width of section 0, and is provided with spaced depressions D and D of which the former is substantially deeper than the latter, both of these depressions being rectangular in shape and so disposed that their direction of greatest length is at right angles to thelongitudinal axis of the section. Thus it will be apparent that when the sections C and D of each part are folded upon one another in the. manner shown in Fig. 1, with the depressions D and. D contacting with the outer surface of section C, the latter will, of necessity, assume a position inclined with respect to section D, whereby the two sections D will form a substantially cylindrical outer surface, while the two sect-ions C will form a gradually tapering inner advancing screw. In this manner the two parts of the shield will be gradually forced apart as a bolt is turned inwardly between them. I

As will be seen plainly in Figs. 2, 3 and 4, thesect-ions C and D are concaved in such a manner that the curvature of the outer section D is in a greater degree than that of the inner section C, and the side edges (3'' of the latter are curved inversely with respect to the curvature ofits body, so as to extend around portions of the side edges of the section D and thus, with the cooperation of the webs E, firmly unite the sections of each of the shield parts.

. requirements, and of performing all the functions of the cast metal shields now in common use, and is susceptible of varied forms, of which we wish to be understood as reserving all such as fall within the terms of the claims. p

We claim 1. An expansion shield formed of asingle piece of sheet metal with a connecting web and comprising two parts bent into juxta posed relation, each of said parts comprising .inner and outer sections having connecting webs and bent one upon the other.

2. An expansion shieldformed of a single piece of sheet metal with a connecting web and comprising two parts bent into juxtaposed relation, each of said parts comprising inner and outer sections bent one upon the other and having means whereby to maintain theirproper relation.

3. An expansion shield formed of a single piece of sheet metal with 'a connecting Web and comprising two parts bent into juxta- -posed relation, each of said parts comprising inner and outer sections bent one upon the other, the former having extended side edges bent about the side edges of the latter.

4. An expansion shield formed of a single piece of sheet metal with a connecting web and comprising two parts, said parts being bent into juxtaposed relation and each comprising transversely curved inner and outer sections, bent one upon the other, the former.

having extended side edges inversely curved about the side edges of the latter.

5. An expansion shield formed of a single piece of sheet metal with a connecting web and comprising two parts, said parts being bent into juxtaposed relation and each com-' prising inner and outer sections also bent into juxtaposed relation, the inner sections having transverse corrugations vcooperating to form a bolt advancing screw.

- 6. An expansion shield formed of a single piece of sheet metal with a connecting Web and comprising two parts, said parts being bent into juxtaposed relation and each comprising inner and outer sections also bent into juxtaposed relation, the inner sections having transverse corrugations arranged in spaced series and adapted to cooperate to form a bolt advancing screw.

In testimony whereof weafiix our signatures in presence of two witnesses.

HENRY B. NEWHALL, JR. HENRY W. PLEISTER.

Witnesses:

C. M; LYoNs, A. M. WILLIAMS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

